Would like someone to help?

Ok so inwas in maths and I got this girl that sits next to me and we are talking and stuff. Somehow we got onto the subject of my old biology teacher is a ****** so I said he always stares at me...she says maybe he thinks your sexy...I said why would he think that and she says "pfft for obvious reasons"....now we both hate this teacher so I wanna find out what the girl was implying by her comment. Any help appreciated